摘要
应用腐蚀速率计算方法、分光光度法,结合XRD及ATP、HPCs细菌检测等技术,从腐蚀速率、铁释放、腐蚀产物成分及腐蚀细菌的分布等方面,研究了不同浓度的硝酸盐对碳钢腐蚀的影响。研究发现,C(NO_3^-):0、10、100、1000 mg/L四种工况对比,C(NO_3^-):10 mg/L下碳钢腐蚀速率及总铁释放量最低,表现出抑制腐蚀;碳钢表层铁的氧化物薄膜以及腐蚀产物α-FeOOH消失和再生生成的密实腐蚀垢有助于抑制腐蚀;由于硝酸盐浓度对硝化细菌、氮还原细菌、铁氧化细菌及产酸细菌含量的影响,这些腐蚀细菌作用下形成的密实腐蚀垢、γ-Fe_2O_3保护膜及生物膜都有助于抑制腐蚀。相反,其它工况下均表现出较大的腐蚀性。
The effect of nitrate concentration on the corrosion of carbon steel in reclaimed waters were studied in terms of corrosion rate, iron release, corrosion product composition and the distribution of corrosion bacteria etc. by means of corrosion rate calculation, spectrophotometry and XRD, as well as bacteria detections with adenosine-triphosphate（ATP） and heterotrophic plate counts（HPCs）. By comparison of results with four different concentration of C（NO3^-）： 0, 10, 100 and 1000 mg/L, it is found that nitrate has inhibition effect on the corrosion and iron release, and among others, the concentration of C（NO3^-） 10 mg/L is the optimal, therewith the corrosion product α-FeOOH on carbon steel disappeared, while a dense corrosion scale formed, thus suppressing the corrosion. Meanwhile, due to the effect of nitrate concentration on the among of nitrifying bacteria, nitrogen reducing bacteria, iron oxidizing bacteria and acid-producing bacteria, thereby the formation of dense corrosion fouling, γ-Fe2 O3 protective film and biofilm are all beneficial to the inhibition effect on the corrosion of carbon steel in the reclaimed water with C（NO3^-） 10 mg/L.
作者
张雅君
吕静静
孙丽华
张启伟
杜婷婷
ZHANG Yajun;LV Jingjing;SUN Lihua;ZHANG Qiwei;DU Tingting(Key Laboratory of Urban Stormwater System and Water Environment, Ministry of Education, Beij＇ing University of Civil Engineering and Architecture, Beijing 100044, China;School Environment and Energy Engineering, Beijing University of Civil Engineering and Architecture, Beijing 100044, China;Beijing Suburban Water Affairs Center, Beijing 100195, China)
出处
《腐蚀科学与防护技术》
CAS
CSCD
北大核心
2018年第3期259-265,共7页
Corrosion Science and Protection Technology
基金
国家自然科学基金(51678027)~~
关键词
硝酸盐浓度
腐蚀速率
铁释放
腐蚀产物
腐蚀细菌
nitrate concentration
corrosion rate
iron release
corrosion product
corrosion bacteria
